PCA9539BS,115

I/o Expanders Overview

The PCA9539BS,115 is a 24-pin CMOS device providing 16-bit general-purpose parallel input/output expansion with interrupt and reset for I2C-bus/SMBus applications. It operates within a power supply voltage range of 2.3 V to 5.5 V and features 5 V tolerant I/Os. The device includes polarity inversion registers, active LOW interrupt output, and active LOW reset input. It supports clock frequencies from 0 Hz to 400 kHz and offers low standby current consumption. ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101. Latch-up testing meets JEDEC Standard JESD78, exceeding 100 mA. The component is housed in an HVQFN24 package (SOT616-1) and operates across a temperature range of -40 °C to +85 °C.

I/o Expanders Feature Summary

• Provides 16-bit I2C-bus GPIO expansion with interrupt and reset capabilities
• Features 5 V tolerant I/Os and polarity inversion registers
• Includes active LOW interrupt output and active LOW reset input
• Offers noise filtering on SCL/SDA inputs and internal power-on reset

I/o Expanders Applications

• ACPI power switches
• Sensor interfaces
• Push button detection
• LED control circuits
• Fan control systems

I/o Expanders Procurement Notes

Verify the ordering suffix ,115 corresponds to the HVQFN24 package in Reel 7" Q1/T1 packing method with a minimum order quantity of 1500 units. Confirm the operating temperature range is -40 °C to +85 °C. Ensure compatibility with the specific pin 1 quadrant designation required for your board layout. Cross-reference the type number PCA9539BS with the datasheet to confirm it matches the standard marking version.

I/o Expanders Selection Notes

Select this part when 16-bit I/O expansion is required alongside interrupt and reset functionality. Consider the PCA9539R variant if the reset pin should only initialize the state machine without affecting internal registers. Verify that the 2.3 V to 5.5 V operating voltage range aligns with the system's VDD. Ensure the I2C bus speed requirements do not exceed 400 kHz. Check if the HVQFN24 package dimensions fit the available PCB space.

I/o Expanders Part Context

The PCA9539 series enhances NXP Semiconductors' family of I2C-bus I/O expanders. It is identical to the PCA9555 except for the removal of internal I/O pull-up resistors, replacement of the A2 address pin with a RESET pin, and a different address range. This design reduces power consumption when I/Os are held LOW. The device allows up to four units to share the same I2C bus using hardware pins A0 and A1 for address variation.

I/o Expanders Replacement Considerations

The PCAL9539A is a pin-to-pin replacement for the PCA9539 and PCA9539A. Note that the PCAL9539A powers up with all I/O interrupts masked by default, preventing spurious interrupts during board bring-up. Verify register compatibility and interrupt handling logic differences before substitution.